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Notes
AGRICULTURE, FORESTRY AND
MEDICINAL PLANTS
Evolution of human civilization has depended mainly on agriculture. It has not only
given man the freedom from the risks of hunting and collecting food from the forest
but has also given assurance of continuous availability of food.
Agriculture plays an important role in providing basic necessities of mankind in
three ways – food, clothes and shelter. In addition to agriculture, we draw many
essentials for our living from nature. Forests play a very important role in providing
useful products for man e.g. rubber, supporting wildlife, e.g., such as tiger and
improving the environment. Medicinal plants many of them obtained from forests,
provide important drugs, which are used for treating a large number of diseases.
In this lesson, you will learn about agriculture, forestry and medicinal plants.
OBJECTIVES
After completing this lesson, you will be able to:
l
state the major role of agriculture;
l
classify the crops giving examples under each category and also mention their
importance;
l
briefly describe the cultivation of cereals crops viz wheat and rice along with
cotton and sugarcane;
l
define green revolution and list the factors that made it possible;
l
explain the principles of farm management and the proper ways of storage of
food grains;
l
mention the utility and the method of establishing a kitchen garden;
l
define the term forestry;
l
name the different types of forests, appreciate their effects on ecosystem and
enumerate the commercial products provided by it;
l
list the common names of some medicinal plants giving their uses in treating
various diseases.
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Notes
31.1 ROLE OF AGRICULTURE
Food and clothing are the basic needs of man. Whatever we eat in our daily life,
most of them we get from plants. The clothes we wear are also made from plants
e.g. cotton is a plant product. Plants provide most of the basic necessities of life
to human beings. These include (1) Food (cereals, fruits, oil seeds etc.) (2) Fibres
for making clothes (cotton, jute, etc.) (3) Beverages (tea, coffee, etc.) (4) Forests
(timber, rubber etc.). Herbivores consume plants as their food. Plants can be of two
types i.e. cultivated and wild plants.
Cultivated and Wild plants
Plants which are specially grown by humans are called cultivated plants e.g. wheat,
rice. The plants that grow by themselves in nature are called wild plants e.g bathua,
cholai etc.
31.2 CLASSIFICATION OF CROPS
Crops are grown regularly in large numbers in fields for food or for obtaining other
products. Crops are classified in a number of ways as follows:
(i) According to use, crops may be classified into food crops and cash crops.
Table 31.1 Difference between food and cash crops
Food Crops
Cash Crops
1. They are grown to provide food
and may be stored for a long period
e.g. wheat, rice, vegetables.
1. Plants or plant products which
can be sold and money can be
earned out of it. e.g. tea, jute
cashew nut, rubber, sugarcane.
(ii) According to the season of growing, crops are classified into three types1.
Rabi crops (grown in winter) : Wheat, gram, pea etc.
2.
Kharif (grown in monsoon
rainy season)
: Maize, jowar, bajra etc.
3.
Ziad crops (grown during
summer)
: Melon, cucumber, water melon etc.
(iii) According to the edible parts of the plant, the crops are termed as
follows :
58
1.
Cereal crops (seed grains)
- Wheat, rice, maize etc.
2.
Fruit crops
- Mango, apple, grape, banana etc.
3.
Vegetable crops
- Ladiesfinger, tomato, cauliflower etc.
4.
Stem crops
- Potato, sugarcane, colocasia etc.
5.
Root crops
- Radish, carrot, sweet potato etc.
6.
Leaf crops
- Spinach, mustard (sarson), maithi etc.
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(iv) The most widely used general classification of crops are1. Cereal Crops
Cereals are used as food not only in India but all over the world. They are rich
in carbohydrates and grown for food. It includes wheat, rice, maize, bajra, barley,
rye, oat, sorgham (jowar), ragi etc. These are consumed by animals as well as by
human.
Notes
2. Pulse Crops
It includes all the types of ‘dals’ (pulses) we use as a food, these are also called
as leguminous plants. They are rich sources of protein e.g. sweet peas, gram, pigeon
pea (arhar), soyabean, beans, ground nut, lentil etc.
Agricultural importance of pulse crops
All leguminous plants have special nodules (swellings) in their root system
and these contain bacteria. (Fig 31.1) These bacteria fix atmospheric
nitrogen directly and change it into nitrogen compounds. This process is
known as nitrogen-fixation. These nitrogen compounds are used by the
plants as a natural nitrogen fertilizer. For this reason farmers practise crop
rotation i.e. they grow a pulse crops in between two cereal crops to enrich
the soil to get a better yield of the crop.
Fig. 31.1 Leguminous plants contain nodulated bacteria.
3. Fruit crops
(i) Fruits are rich in vitamins, mineral and carbohydrates. Fruits provide vitamins,
minerals and variety to our diet. Some fruits are also a rich source of sugar
e.g. grape, banana and mango.
(ii) Fruits are consumed fresh or in the form of juice, jam etc. examples – mango,
apple, banana, oranges, pomgranate etc.
(iii) Fruit trees are usually perennial trees, which bear fruits once a year. Many fruit
crops are grown in India examples – chickoo, mango, apple, orange etc.
4. Vegetables Crops
Vegetables provide minerals, proteins and carbohydrates. A large number of
vegetables are grown in our country. Some important ones are e.g. potato, tomato,
pea, cauliflower, brinjals, gourds etc.
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5. Stem Crops
Ginger, potato, onion, garlic, colocasia are the examples of stem crops. Sugarcane
is the main source of sugar in our country. Sugarcane is an annual cash crop.
Notes
6. Root Crops
Carrots, radish, sweet potato and turnip are the examples of root crops.
7. Leaf Crops
Spinach, Methi, Corainder, Mint and mustard are the examples of leaf crops.
8. Oil Seed Crops
Oils are an important part of our food. They are a rich source of energy. Seeds of
some crops yield oil on being pressed in machines. The remainder becomes the
seed cake to be used as cattle feed. Some of the oil yielding crops are groundnut,
cottonseed, coconut, mustard and sunflower.
9. Fibre Crops
The two most important fibre crops of our country are cotton and jute. They supply
the raw materials for our textile and jute industries.
Retting
The process by which the fibres are separated from the jute plant is called
retting.
In this process we make small bundles of plants. These bundles are kept
in side pond or canal 15 days. During this period degradation process occurs
in the presence of certain bacteria, and the fibres are separated easily, they
are then washed and dried.
INTEXT QUESTIONS 31.1
1. Give the difference between cultivated plants and wild plants.
............................................................................................................................
2. Give two examples each of Rabi crop and Kharif crop.
............................................................................................................................
3. Match the items in Column I with those in Column II
Column I
Column II
1. Pulse crops
A. a nutritious fruit
2. Oil seed crop
B. ground nut
3. Soya bean
C. rich source of protein.
4. Banana
D. nitrogen fixing bacteria
4. Name four oil seed crops.
............................................................................................................................
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31.3 CULTIVATION OF WHEAT, RICE, COTTON AND SUGARCANE
(a) Cultivation of wheat
Wheat belongs to the family Poaceae (Graminae). The grains are rich in carbohydrates.
This is the winter season crop. Method of cultivation are as follows :
1. Area of production UP, Punjab, Haryana, Rajasthan, Madhya Pradesh, Bihar,
Maharastra etc.
2. Soil
grow in loamy soil
3. Climate
Cool weather with moderate rainfall
4. Temperature
10-15°C (during winter season)
5. Irrigation
4-5 times its cultivation
6. Harvesting
April to May in northern India
7. Botanical Name
Triticum vulgare
Notes
(b) Cultivation of rice crop
Rice is one of the major crop of India. About 23 percent of the total cultivated area
of the country cultivates this crop. Method of rice cultivation is as follows 1. Area of production UP, Bihar, West Bengal, Assam, Andhra Pradesh, Punjab,
Tamil Nadu, Orissa
2. Soil
deep fertile loamy, clayey loam, loamy
3. Climate
Tropical and moist with 125 cm rainfall
4. Temperature
20-25°C
5. Irrigation
every weeek, soil should not be dry
6. Harvesting
September -October in northern India
7. Botanical Name
Oriza sativa
(c) Cultivation of cotton
Cotton is one of the major crops of India. The fibre of cotton is used as raw material
for the textile industry. Cotton seeds after extraction of the oil are also used as a
cattle feed. Methods of cotton cultivation is as follows 1. Area of production Punjab, Haryana, Maharastra, Gujarat, Andhra Pradesh,
Rajasthan, Karnataka, Madhya Pradesh, Tamil Nadu
2. Soil
Black cotton soil of deccan plateau and alluvial soil of
the northern plain.
3. Climate
cloud free weather for about 150 days with 75 cm rainfall
at the time of flowering and boll opening
4. Rainfall
moderate rainfall of about 75 cm
5. Specific characters 1. Indian cotton is used for coarse cloth
2. Fruit is capsule
3. Oil is used for cooking and oil cake for feeding cattle.
6. Botanical Name
Gossypium sp.
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Notes
(d) Cultivation of sugarcane
Sugarcane is the main source of sugar in our country. This is an annual and cash
crop. India is the original land of this crop. Sugarcane is sown by “setts” (pieces
of stem containing buds). Method of sugarcane cultivation is as follows 1. Area of production Punjab, Haryana, UP, Bihar, Gujarat, Maharastra,
Karnataka, Andhra Pradesh, Tamil Nadu
2. Soil
Heavy loamy soil
3. Climate
hot and humid
4. Harvesting
from mid February to mid March in North India. From
20th September to 20th October in West India and
slightly earlier in south India.
5. Irrigation
1st after one month of sowing in summer on every 10th
day. In winter on every 15th day
6. Botanical Name
Saccharum officinarum
31.4 GREEN REVOLUTION
In 1952, the yield of Wheat and Rice was 654 kg and 800 kg per hectare,
respectively. This yield was insufficient to fulfil the demand. Therefore our
Government and Agriculture Scientists paid a special attention towards the
improvement of agriculture. By doing so, the production of cereal crops increased
tremendously and we became self-sufficient. The various steps taken to achieve this
goal have been collectively termed as green revolution.
Green Revolution: Spectacular increase in the yield of crops, particularly
cereals, through the application of modern techniques in agriculture is
called Green Revolution
The factors which help to bring about the green revolution are:
1. Introduction of high yielding varieties of crops.
2. Multiple cropping, better irrigation and sufficient supply of fertilizers.
3. Use of crop protection measures against diseases and pest.
4. Transfer of the technology of scientific farming from research farms to villager
farmers.
5. Organised transport arrangements to reach the produce from the fields to
market.
31.5 FARM MANAGEMENT
Effective farm management requires detailed planning for growing high
yielding crops and their storage.
There are various steps involved in farm management are as follows:
1. Correct preparation of the soil.
2. The right variety and quality of seeds or saplings for planting.
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3. The right amount of water and time at which it has to be supplied.
4. The amount and time of application of fertilizers.
5. Timely application of pesticides.
After harvesting, proper storage of the crop is very important to avoid loss and
wastage due to lack of transit from field to the consumer.
Notes
1. Proper storage of Food
Food is spoilt, by variations in temperature, humidity, insects, microorganisms,
rodents, birds and animals. Food grains are therefore stored in waterproof and
airtight containers. Small farmers, store the grain in jute bags in godowns with
pucca floor, plain roof and single entrance. Special large sized godowns like silos
are used these days at the government level.
2. Storage and Preservation of Fruits and Vegetables
Fresh fruit and vegetables are kept in cold storage at low temperatures to help retain
their nutritive value and reduce losses from spoilage.
These are preserved by other methods also as given below(i) Dehydration and Sun drying to remove water and thus prevent growth of microorganism.
(ii) Pickling by using large amounts of salt, vinegar and spices.
(iii) Canning (storing in plastic or metallic cans)
31.6 KITCHEN GARDEN
Kitchen garden is a small garden next to a house. It is grown mainly as a hobby
but is becoming very popular these days. The persons living in house grow
vegetables in earthen posts. Wooden boxes as well as in the soil beds.
The common vegetables grown in kitchen garden are cauliflower, brinjal, tomato,
radish, potatoes, lady’s finger, mint, onion etc. Some common fruit trees like lemon,
papaya, custard apple, guava may also be grown.
The three main advantages of a kitchen garden are:
(i) It provides a light exercise to the gardener.
(ii) It adds beauty to the house.
(iii) Fresh vegetables are available at any time.
INTEXT QUESTIONS 31.2
1. Give botanical names of wheat and cotton and climatic conditions in which thy
are grown.
............................................................................................................................
2. Give two advantages of green revolution.
............................................................................................................................
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Notes
3. What is meant by farm management?
............................................................................................................................
4. What is a kitchen garden? Give any one advantage.
............................................................................................................................
5. Mention two ways of the storage of food.
(i) ..................................................................................................................
(ii) ..................................................................................................................
31.7 WHAT IS A FOREST
Just any kind of vegetation is not a forest. The rows of trees along the roadside
is not a forest. A piece of land with hundred or more mango tree is again not a
forest. The reeds and tall grasses growing along the bank of a river is also not a
forest. Then what is a forest.
A forest is a large area of land with a lot of vegetation but dominated by various
types of trees. These trees are usually of different species and are of different
age. Wild animals may or may not be present.
Forestry is the science of study of forest
31.7.1 Types of forests
The different kinds of forests are:1. Coniferous forest
Trees with needle-like leaves with persistent foliage and cone bearing reproductive
organs. Found in cold or temperate cold climates e.g. Pine, Cedrus (Deodar), Fir
etc.
2. Deciduous forest
Most of the trees in such forests drop their leaves in winter and new leaves grow
in springs. There are found in temperate warm and temperate cold climates e.g.
Oak, beach, heath, hickory, bassword, chestnuts, bitch bine, cypress.
3. Tropical rain forest
Trees with broad-leaves, deciduous or evergreen. Such forest occur in warm
climate. Zones of the world with high rainfall. Trees are covered with epiphytes
and the soil in which humus large number of animals inhabit such forests e.g. vines,
creepers, lianas and orchids.
31.7.2 Importance of forest
Forest plays an important role in various ways.
1. Forest as an Ecosystem
If you walk through a forest you may find various insects, birds, animals and wild
beasts. There are different kinds of organisms living in close association with each
other, feeding on others and being themselves eaten by some others. The ants,
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termites and bacteria break down the dead wood, the fallen leaves and the excreta
of animals, into simpler compounds, which become a part of soil. The ultimate
source of energy is the solar energy, which is trapped by the green leaves. This chain
of getting food and energy goes on and on. Such a community of organisms along
with its environment is called an ecosystem. Thus forest is an ecosystem.
2. Forests Improve the Environment in many ways
Notes
(a) Forests release oxygen
Plants in forests take in large quantities of carbon-dioxide and improve the
quality of air by releasing oxygen into the atmosphere during the process of
photosynthesis.
(b) Forests prevent soil erosion
Plants in forests check soil erosion in four ways :
(i) Roots hold the soil particles together preventing them from being washed
away
(ii) Leaves and branches take much of the force of the falling rain thus
checking the loosening of top soil.
(iii) Trunks reduce the force of flowing waters, thus checking soil erosion as
well as preventing floods.
(iv) The tall trees reduce the wind velocity during storms and thus check the
top soil from being blown away.
Thus the forests help in retaining the fertile topsoil not only in the forest
but also in the neighbouring fields.
(c) The forest trees hold sufficient moisture in their root system.
(d) The forest trees release large quantities of water vapour through their leaves
(by the process of transpiration) thus adding to the moisture in the atmosphere
and brings rains.
Through these and many other similar ways the forest help in maintaining the
quality of physical environment (climate, etc.)
3. Forests Support Wild Life
The wild animals are nature’s great beautfies and even more than that they maintain
proper balance in their ecosystem through food chains. Many forests in our country
have been specially reserved for preserving wild life. These also are a source of
knowledge and provide recreation to people all over the world.
4. Forests provide Commercial Products
Forests are full of commercially important products. They provide us many
materials e.g. wood, resin, lac etc. These basic products are used in making
furniture, tyres, paints, varnishes, fuel etc. by different methods.
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5. Forests supports Sericulture and Lac Culture
Notes
Sericulture is the breeding and management of insects for the production of silk.
You will know more about it in the lesson no.35. and lac is used in several ways.
Its commercial use is in the polishing wooden furniture. The other common use
is in sealing parcels, packets and envelopes. You will also learn more about the
culture of lac in the lesson 35.
Forest maintains the proper balance of atmospheric gases and stabilizes the climatic
conditions. They provide hundred kinds of usable materials. They are indeed a
nation’s wealth. Forestry is a science in itself. Overall the forests are not only vital
for the sustenance of life on earth but also provide a lot of usable materials.
INTEXT QUESTIONS 31.3
1. Mention four ways in which forest are useful
(i) ..................................................................................................................
(ii) ..................................................................................................................
(iii) ..................................................................................................................
(iv) ..................................................................................................................
2. How can forests help us in improving the environment?
............................................................................................................................
3. List different types of forests ?
............................................................................................................................
31.8 MEDICINAL PLANTS
Each one of us must have suffer from some disease or other in our life. For
treatment, we depended upon medicines. Most medicines are obtained directly or
indirectly from plants. All the major system of medicines such as Allopathy,
Homeopathy, Unani and Ayurvedic use most of the drugs obtained from plants.
31.8.1 History
The history of the medicinal plants is as old as the history of human being. The
primitive man attempted to cure his ailments with all sorts of materials around him
including plants as well as animals. Discovery of their medicinal values was mainly
by trial and error. For example, quinine is the drug for curing malaria and amla
is effective in curing many diseases of the digestive system, the heart, the respiratory
system and skin diseases.
All the early civilizations like the Egyptian, the Babylonians, the Sumerians, the
Greeks and the Romans have mentioned a large number of modern medicines that
were used in their time. In China, plants has been utilized as a source of drugs for
more than 6000 years ago. Curative nature of various plants have been mentioned
in the Bible and the Vedas. In India, the earliest reference of medicinal plants is
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written in the Rigveda (3500-1800BC). A vast varieties of medicinal plants are
described in the Atharavaveda (200-100 BC). After Vedas, two Indians named
Charaka and Sushruta has worked on Indian system of medicine (Ayurveda) in the
form of Charaka Samhita (1000BC-100AD) and Sushruta Samhita respectively.
Sushruta Samhita deals with about more than 700 drugs.
There are many plants, which provide medicines. These medicines are used
for treating many diseases. These plants are described in tabular form as below
(Table 31.2 on page 68-70)
Notes
31.8.2 Drugs obtained from other plants
In addition to the above mentioned higher plants, some very important drugs like
the antibiotics are obtained from the lower plants like fungi e.g. Pencillin,
Streptomycin, tetracycline etc. Similarly, Ergot, which is derived from another
fungus Claviceps purpurea, is used in obstetrics for accelerating childbirth. It is also
used extensively to increase blood pressure and for controlling uterine haemorrhage
after child birth.
31.8.3 Central Drug Research Institute of India (CDRI)
This is located in Lucknow. Here extensive research is done on the drugs their
sources, extraction and effects. Regular attempts are made to fine out new medicines
from herbs for treating various diseases.
INTEXT QUESTIONS 31.4
1. Match correctly the name of the drug with the disease against which it is
effective, by writing the corresponding number within brackets.
Drug
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
Reserpine
Alloin
Quinine
Taral
Tylophoine
Morphine
Vincristine
Flavonoids
Disease
(
(
(
(
(
(
(
(
)
)
)
)
)
)
)
)
(i)
(ii)
(iii)
(iv)
(v)
(vi)
(vii)
(viii)
Malaria Fever
Jaundice, Diabetes
Treatment of leukaemia
heal wounds
Blood pressure
inhibits cell division
remedy for cancer
Relieve pain and relax muscular
Contraction
2. Name four plants which provide medicines.
............................................................................................................................
3. Where is CDRI located?
............................................................................................................................
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Notes
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68
Table 31.2 Some medicines obtained from plants
S.No
Name of Plants
Name of the Drug
Obtained
Part from which
Obtained
Diseases for which
may be used
Special Features and
Distribution
Sarpagandha (Rauolfia
serpentina)
“Reserpine”
Dried roots with intact
bark from 3-4 years old
plants
To reduce blood pressure; as a
tranquilliser for mild anxiety
patients
Erect shrub with whorled
leaves found in almost all
parts of India.
2.
Kunain “ Quinine”
(Cinchona officinalis)
Quinine
Bark of the tree
Malaria, Pneumonia, Amoebic
dysentery and for eye lotions
In India, Cinchona is cultivated
in Nilgiris, Sikkim, Assam and
Bengal. Trees are propagated from
cutting, bark of the trunk, branches
and roots are removed from 6-8
year old trees.
3.
Pine , “ Chir” Scot pine Volatile oil consists
(Pine sylvestris)
of pinere
Purification of resin
extracted from the stem
Chronic bronchitis and flatulent
colic; as an ointment in
rheumatic pains
Large trees with needle like
leaves in clusters of trees found
in the lower Himalayas and
other hills of India
4.
Tylophora asmatica
Tylopherine
Leaves
Anti-inflammatory and anti-tumour
properties. Specific remedy for
asthma
Perennial twining, climber with lance
shaped leaves, greenish flowers.
Native to India
5.
Aloe vera
Aloin, Aloin emolin
Aloection-B
Leaves
Get from the leaves heals wounds,
emollient laxotive and useful for
any skin condition that needs
soothing
Native to America, cultivated as a
pot plant.
Agriculture, Forestry and Medicinal Plants
BIOLOGY
1.
“Dhatura” (Datura
stramonium)
7.
Alkaloid
hyoscyamine
Leaves
Bronchitis and asthma; gives
relief from pain in sudden
muscular contractions of the
body
Bushy plant with large leaves
and white flowers grown in
upper Himalayas and in hilly
regions of central and
southern India.
Belladona “ Angurshafa” Alkaloid
Deadly Nightshade
hyoscyamine and
(Atropa belladona)
atropine
Leaves
Relieves pain due to mauscular
contractions specially that of
intestines also effective in
whooping cough & asthma
Atropine is used to dilate
the pupil of the eye
Erect perennial herb with
brownish-green leaves and
yellowish brown flowers.
Found in India only under
cultivation
8.
Tulsi (Ocimum sanctum) Essential oil
Leaves
Bronchitis, Catarrh, cold and
digestive complaints. Its oil is
applied locally on ring worm
and other skin diseases
Much branched, hairy, erect
and scented herb.
9.
“Neem” Margosa tree.
(Azadirachta indica)
Azadirachtin
Leaves, bark fruit/seeds
For fever to break its periodic
sequence; also useful in treating
skin diseases.
Tree with pinnate leaves and
green fruits
10.
Eucalyptus “Safeda”
(Eucalyptus globulus)
Essential oil
contains eucalyptol
and pinene
Leaves from which a pale Used in the treatment of nose
yellow, spicy pungent oil and throat disorders and fevers
is obtained
Native to Australia commonly
grown in all parts of India. Tall
trees with whitish bark and long,
blue green leaves.
11.
“Mahua” (Madhuca
indica)
Alkaloid and
seponin
Flowers, seed oil
Large deciduous tree with large
and thick leaves. Flowere small
fleshy with brownish hairs. Grown
in the plains and foot hills of India
specially in Himalayas.
Used in the treatment of diseases
of the respiratory system like
cough & bronchitis
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Notes
69
alkaloids
and flavonoids
13.
Catharanthus roseus
“Sadabahar”
14.
Leaf, flower and young
shoot
All tropical and subtropical regions
on earth small herb with pinnate
leaves, flower arising below the
mid rib
Vinblastin, Vincristine Leaves and stem
Treatment of leukaemia - a form
of cancer
Annual and perennial herbs with
simple opposite leaves and funnel
shaped flowers that bear 5 stamens
fused to the inside the tube.
Madagasker, widely naturalized
through out the tropics.
“ Aphim” opium
(Papaver somniferum)
Dried, brownish
juice obtained from
unripe fruits,
contains morphine
Fruit
Used to relieve pain, induce
sleep and relax muscular
contractions.
Annual herb with large showy
white flowers, cultivated
extensively in India.
15.
Amla ‘Indian
Gooseberry” (Emblica
officinalis)
Used in drugs like
“Chyavan Praash”
and “Triphala”
Fruit
To treat constipation, diarrhoea,
dysentery, enteric fever,
indigestion and enlarged liver,
anaemia, jaundice, cough, fungal
infections, scurvy.
Tree with pinnate leaves; fruits
fleshy, roundish indistinctly
marked into 6 lobes, rich in
vitamins C. plants occurs
throughout plains and foothills.
In India abundant in Madhya
Pradesh
16.
Texus baccata “yew”
Taxol
Leaves
Taxol inhibits cell division and is
a very important anticancer drug.
Grows in northern temperate zones.
Trees are 25 m height. Has rust red
bark and dark green needle like
leaves.
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Jaundice, Gonorrhea, Diabetes
and skin problems
Economic Biology
Notes
Phyllanthus emblica
(Indian Gooseberry)
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WHAT YOU HAVE LEARNT
l
Agriculture plays a major role in providing food, clothing and other human
needs.
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The important food crops are cereals, millets, fruit crops, vegetable crops, pulses
and oil seeds.
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Spectacular increase in the yield of crops, particularly cereals, through the
application of modern techniques in agriculture is called Green Revolution.
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Modern agriculture requires special inputs of fertilizers, proper irrigation, crop
protection against diseases and pests, breeding of disease resistant and highyielding varieties.
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Proper storage and preservation of food is very important in order to avoid
losses.
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A kitchen garden provides fresh vegetables all the year round.
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A forest is a large area of land with a lot of vegetation dominated by trees.
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There are four major kinds of forests – Rain forests, Tropical forests, Deciduous
forests and Coniferous forests.
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Forest is an ecosystem with its community of organisms and the physical
environment, in which the ultimate source of energy is the Sun.
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Forests improve the environment by removing large quantities of carbon dioxide
from the atmosphere and by adding oxygen to it. They bring rains, prevent
floods and cut down soil erosion.
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Forests support wildlife. Forests provide several commercial products such as
wood and medicines.
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Rubber is an important yield of forest trees which are now being widely
cultivated and further improved.
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Common drugs used to treat a variety of diseases are obtained from different
parts of the common plants.
Notes
TERMINAL QUESTIONS
1. What do you mean by the term “ Green Revolution”? List the factors that helped
to bring it about.
2. Explain the principle of farm management.
3. Which are the different methods of preserving fruits and vegetables?
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MODULE - 6B
Agriculture, Forestry and Medicinal Plants
Economic Biology
4. How does food get spoilt?
5. Why is agriculture said to paly a major role in providing important human
needs?
6. Define a forest. What are the main types of forests?
Notes
7. How are forests helpful in maintaining proper environment?
8. List and classify the commercial products obtained from forests.
9. Which important drugs are obtained from lower plants?
10. Name the source of the following drugs:
(a) Reserpine
(b) Quinine
(c) Seponin
(d) Morphine
ANSWER TO INTEXT QUESTIONS
31.1 1. Cultivated plants grown by man, wild plants grow themselves.
2. Rabi crop
e.g. 1. Wheat
2. Gram
Kharif crop
e.g. 1. Maize
2. Jowar
3. 1. D
2. B
3. C
4. A
4. 1. Cottonseed
2. Ground nut
3. Mustard
4. Coconut
31.2 1. (i) Triticum valgare, cool weather with moderate rainfall, temperature
10-15°C
(ii) Gossipium Sps. cloud free weather with 75 cm rainfall.
2. Spectacular increase in the food/crop production specially cereals, using
modern technique in called Green Revolution.
3. details planning for growing high yielding crops and their storage
4. (i)
Food can be stored in airtight, water proof containers
(ii) Special large sized godowns like silos.
5. is a small garden next to house. advantage - adds beauty to the house,
fresh vegetables are available at any time.
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BIOLOGY
MODULE - 6B
Agriculture, Forestry and Medicinal Plants
Economic Biology
31.3 1. (i)
Forest as an ecosystem.
(ii) Forest improves environment by cleaning air, and preventing soil
erosion.
(iii) Forest support wild life
Notes
(iv) Forests provide commercial products
2. release oxygen prevent soil erosion holding moisture through root system
and releases large quantities of water vapour through their leaves by the
process of transpiration adding moisture for bringing rains.
3. Coniferous, Deciduous and Tropical rain forest.
31.4 1. (a)
(v)
(b) (iv)
(c) (i)
(d) (vi)
(e) (vii)
(f) (viii)
(g) (iii)
(h) (ii)
2. (i)
Sarpagandha (Rauvolfia serpentina)
(ii) Quinine (Cinchona officinalis)
(iii) Pine “Chir” (Pine sylvestris)
(iv) Taxol (Taxas baccata)
3. Lucknow
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